public Lookup GetLookup(MetadataColumn column)
{
Lookup lookup;
if (!_lookups.TryGetValue(column.Index, out lookup))
{
lookup = new Lookup();
_lookups.Add(column.Index, lookup);
}
return(lookup);
}
public MetadataCell this[MetadataColumn column]
{
get
{
if (column == null)
{
throw new ArgumentNullException("column");
}
return(this[column.Index]);
}
}
public IEnumerable <MetadataRow> LookupRows(TableId tableId, MetadataColumn column, int target, bool simple)
{
var table = GetTable(tableId);
if (table == null)
{
return(Enumerable.Empty <MetadataRow>());
}
var lookup = table.GetLookup(column);
IList <int> list;
var rowCount = GetRowCount(tableId);
while (lookup.LastIndex < rowCount)
{
var row = GetRow(tableId, lookup.LastIndex);
int key = simple ? row[column].Index - 1 : (int)((SimpleIndex)row[column].Value);
if (!lookup.TryGetValue(key, out list))
{
list = new List <int>();
lookup.Add(key, list);
}
list.Add(lookup.LastIndex);
for (lookup.LastIndex++; lookup.LastIndex < rowCount; lookup.LastIndex++)
{
row = GetRow(tableId, lookup.LastIndex);
int key2 = simple ? row[column].Index - 1 : (int)((SimpleIndex)row[column].Value);
if (key != key2)
{
break;
}
list.Add(lookup.LastIndex);
}
}
if (lookup.TryGetValue(target, out list))
{
return(GetRows(tableId, list));
}
return(Enumerable.Empty <MetadataRow>());
}
public MetadataRow LookupRow(TableId tableId, MetadataColumn column, int target, bool simple)
{
var table = GetTable(tableId);
if (table == null)
{
return(null);
}
var lookup = table.GetLookup(column);
IList <int> list;
if (lookup.TryGetValue(target, out list))
{
return(GetRow(tableId, list[0]));
}
var rowCount = GetRowCount(tableId);
for (; lookup.LastIndex < rowCount; lookup.LastIndex++)
{
var row = GetRow(tableId, lookup.LastIndex);
int index = simple ? row[column].Index - 1 : (int)((SimpleIndex)row[column].Value);
if (index == target)
{
lookup.Add(target, new List <int> {
lookup.LastIndex
});
lookup.LastIndex++;
return(row);
}
if (!lookup.TryGetValue(index, out list))
{
list = new List <int>();
lookup.Add(index, list);
}
list.Add(lookup.LastIndex);
}
return(null);
}
private int GetColumnSize(MetadataColumn c)
{
switch (c.Type)
{
case ColumnType.Int16: return(2);
case ColumnType.Int32: return(4);
case ColumnType.StringIndex: return(StringIndexSize);
case ColumnType.BlobIndex: return(BlobIndexSize);
case ColumnType.GuidIndex: return(GuidIndexSize);
case ColumnType.SimpleIndex: return(GetSimpleIndexSize(c.SimpleIndex));
case ColumnType.CodedIndex: return(GetCodedIndexSize(c.CodedIndex));
default: throw new ArgumentOutOfRangeException();
}
}
internal MetadataCell(MetadataReader metadata, MetadataColumn column, uint value) : this()
{
_metadata = metadata;
Column = column;
Value = value;
}